4M + [ ( 1 - 6M^2 ) / M ] = ( 4M^2 + 1 - 6M^2 ) / M = ( 1 - 2M^2 ) /M
M = 2
( 1 - 8 ) / 2 = ( - 7 ) / 2 = ( - 3,5 )
2sinx(cosx+sinx)=(cosx-sinx)(cosx+sinx)
cosx=-sinx tgx=-1 x=-П/4+Пn
2sinx=cosx-sinx
3sinx=cosx
tgx=1/3
x=arctg(1/3)+Пn
3sinx+cosx=1
6sinx/2*cosx/2=2sin^2(x/2)
sinx/2=0
x=2Пn
3cosx/2=sinx/2
tgx/2=3
x=2arctg(3)+2Пn
<span>P-1/4=3/8+1/4</span>
<span>P-1/4=5/8</span>
P=1/4+5/8
<span>P=7/8</span>
Первая длина = х, вторая = у; система уравнений: х - у = 15 , х + у = 40
х = 27,5; у = 12,5
(3*4*9) - (2*16*3)=108-96=12